UL 391

For UL 391, laboratory is UL LLC; standard title is Solid-Fuel and Combination-Fuel Control and Supplementary Furnaces, verified against its source on 2026-08-10.

Laboratory: UL LLC verified
Standard number: UL 391 verified
Standard title: Solid-Fuel and Combination-Fuel Control and Supplementary Furnaces verified

Sourceosha.gov

Verified2026-08-10

Review by2026-12-08

DatasetWhich OSHA NRTL is recognized for which test standard: all 21 labs' scopes of recognition, cross-referenced

What the source says

UL 391 | Solid-Fuel and Combination-Fuel Control and Supplementary Furnaces |

— osha.gov, retrieved 2026-08-10

Source

osha.govhttps://www.osha.gov/nationally-recognized-testing-laboratory-program/ul

Last verified against source: 2026-08-10. Due for re-check by 2026-12-08. This page as Markdown · OKF bundle · full dataset as JSON.